Stocks climbed in falling volume Friday as the indexes notched their fourth consecutive up week. The Nasdaq advanced 0.6% Friday, rather impressive since it had to overcome Apple's (AAPL) 2% decline. The S&P 500 and the NYSE composite each popped 0.5%. Volume fell across the board. The IBD 50 rose 0.7%. A distribution day was erased on the NYSE composite because of price gains. Distribution involves a significant loss in rising volume, which